CVE-2026-63824 KEYS: fix overflow in keyctl_pkey_params_get_2()
An integer overflow in the Linux kernel key management subsystem allows attackers to trigger a buffer overflow, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63824?
CVE-2026-63824 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
KEYS: fix overflow in keyctl_pkey_params_get_2()
The length for the internal output buffer is calculated incorrectly, which can result overflow when a too small buffer is provided.
Fix the bug by allocating internal output with the size of the maximum length of the cryptographic primitive instead of caller provided size.
Weakness: CWE-787
Which versions are affected by CVE-2026-63824?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63824?
Apply the vendor's patch.
Is CVE-2026-63824 being exploited?
There is no known exploitation of CVE-2026-63824 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63824, DEBIAN-CVE-2026-63824, GHSA-734m-rp66-35q4, ROOT-OS-DEBIAN-11-CVE-2026-63824, ROOT-OS-UBUNTU-2204-CVE-2026-63824, UBUNTU-CVE-2026-63824.